An improved management of an electrical power transmission network is obtained by providing at each of the subscriber premises a load control device which includes a power correction system for applying a capacitive load and/or a switched reactor for voltage correction across the input voltage and a sensing system defined by a pair of meters one at the supply and the second downstream of the voltage correction for detecting variations in power factor. A control system operates to control the power correction system in response to variations detected by the sensing system and to communicate between the load control device and the network control system so as to provide a bi-directional interactive system.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An electrical power transmission network comprising: a plurality of subscriber premises for receiving electrical power, each including a plurality of user devices on a power supply circuit where at least one of the user devices cause power factor variations when operated; transmission lines supplying electrical power; each of the subscriber premises having a drop from one of the transmission lines to a power supply inlet; each power supply circuit including at least one load control device comprising: a sensing system for detecting distortions in the power supply circuit caused by power factor variations caused by said at least one of the user devices; a power correction system for correcting a waveform of the power supply circuit to remove said distortions arising from the power factor variations of said at least one of the user devices; and a control system for controlling the power correction system in response to variations detected; wherein the sensing system comprises a first meter generating data on the drop upstream of the power correction system and a second meter generating data downstream of the power correction system; wherein both meters generate data on the same parameters obtained from the power supply circuit; wherein the control system is arranged to compare the data from the second meter with the data from the first meter to determine a level of improvement in a power factor obtained by the power correction system; wherein the power correction system comprises an active power factor control which comprises an inductor and a switch which connects the inductor in and out of the power supply circuit; wherein the switch is operated in response to the data generated by the sensing system and is switched multiple times per cycle to change an input current draw in a manner to filter out the distortion and shape the waveform into sinusoidal waves in phase with a voltage wave.
2. The network according to claim 1 wherein said two meters each generate data relating to the standard true Root Mean Square (RMS) values of voltage, current and Real Power.
3. The network according to claim 1 wherein the sensing system generates data relating to (Fast Fourier Transform (FFT) spectra of the power supply wave form.
4. The network according to claim 1 wherein the sensing system generates data relating Total Harmonic Distortion (THD).
5. The network according to claim 1 wherein the control system is programmable for disconnecting certain ones of the user devices for load shedding.
6. The network according to claim 1 wherein the control system is programmable to change the response to variations detected by the sensing system.
7. The network according to claim 1 wherein the power correction system is connected along wiring of the power supply circuit as a molded body on a power cord of the power supply circuit.
8. The network according to claim 1 wherein the power correction system is connected in outlets of the power supply circuit for connection of loads.
9. The network according to claim 1 wherein the power correction system is arranged after a power blackout to reinstate priority loads before other loads.
10. An electrical power transmission network comprising: a plurality of subscriber premises for receiving electrical power, each including a plurality of user devices on a power supply circuit where at least one of the user devices cause power factor variations when operated; transmission lines supplying electrical power; each of the subscriber premises having a drop from one of the transmission lines to a power supply inlet; each power supply circuit including at least one load control device comprising: a sensing system for detecting distortions in the power supply circuit caused by power factor variations caused by said at least one of the user devices; a power correction system for correcting a waveform of the power supply to remove said distortions arising from the power factor variations of said at least one of the user devices; and a control system for controlling the power correction system in response to variations detected; wherein the sensing system comprises a first meter generating data on the drop upstream of the power correction system and a second meter generating data downstream of the power correction system; wherein both meters generate data on the same parameters obtained from the power supply circuit; wherein the control system is arranged to compare the data from the second meter with the data from the first meter to determine a level of improvement in a power factor obtained by the power correction system; and wherein power correction system comprises a current inverter which includes a reactor and a switch which connects the reactor in and out of the power supply circuit and is operated in response to the data generated by the sensing system and is switched multiple times per cycle to change an input current draw in a manner to filter out the distortion and shape the waveform into sinusoidal waves in phase with a voltage wave.
11. The network according to claim 10 wherein the current inverter comprises one or more half bridges.
12. The network according to claim 11 wherein the current inverter is arranged to inject power from at least one additional power source additional to and separate from said transmission lines.
13. The network according to claim 10 wherein said two meters each generate data relating to the standard true Root Mean Square (RMS) values of voltage, current and Real Power.
14. The network according to claim 10 wherein the sensing system generates data relating to Fast Fourier Transform (FFT) spectra of the power supply wave form.
15. The network according to claim 10 wherein the sensing system generates data relating Total Harmonic Distortion (THD).
16. The network according to claim 10 wherein the power correction system is connected along wiring of the power supply circuit as a molded body on a power cord of the power supply circuit.
17. The network according to claim 10 wherein the power correction system is connected in outlets of the power supply circuit for connection of loads.
18. The network according to claim 10 wherein the power correction system is arranged after a power blackout to reinstate priority loads before other loads.
19. An electrical power transmission network comprising: a plurality of subscriber premises for receiving electrical power, each including a plurality of user devices on a power supply circuit where at least one of the user devices cause power factor variations when operated; transmission lines supplying electrical power; each of the subscriber premises having a drop from one of the transmission lines to a power supply inlet; each power supply circuit including at least one load control device comprising: a sensing system for detecting distortions in the power supply circuit caused by power factor variations caused by said at least one of the user devices; a power correction system for correcting a waveform of the power supply to remove said distortions arising from the power factor variations of said at least one of the user devices; and a control system for controlling the power correction system in response to variations detected; wherein the sensing system comprises a first meter generating data on the drop upstream of the power correction system and a second meter generating data downstream of the power correction system; wherein both meters generate data on the same parameters obtained from the power supply circuit; wherein the control system is arranged to compare the data from the second meter with the data from the first meter to determine a level of improvement in a power factor obtained by the power correction system; wherein there is provided at least one additional power source additional to and separate from said transmission lines for adding power into the power supply circuit; and wherein said at least one additional power source is connected between the first and second meters so that the first and second meters provide tracking of power added by said at least one additional power source.
20. The network according to claim 19 wherein said two meters each generate data relating to the standard true Root Mean Square (RMS) values of voltage, current and Real Power.
21. The network according to claim 19 wherein the sensing system generates data relating to Fast Fourier Transform (FFT) spectra of the power supply wave form.
22. The network according to claim 19 wherein the sensing system generates data relating Total Harmonic Distortion (THD).
23. The network according to claim 19 wherein the power correction system is arranged after a power blackout to reinstate priority loads before other loads.
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October 22, 2015
October 31, 2017
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